put ecb missing

Author: mattn

README.md

@@ -27,6 +27,8 @@ $ go get github.com/mattn/lastpass-go
 
 MIT
 
+Note that this repository include code of `ecb` (Electronic Code Block) provided by Go Authors.
+
 ## Author
 
 Yasuhiro Matsumoto (a.k.a mattn)

ecb/ecb.go

@@ -0,0 +1,76 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Electronic Code Book (ECB) mode.
+
+// ECB provides confidentiality by assigning a fixed ciphertext block to each
+// plaintext block.
+
+// See NIST SP 800-38A, pp 08-09
+
+package ecb
+
+import (
+	"crypto/cipher"
+)
+
+type ecb struct {
+	b         cipher.Block
+	blockSize int
+}
+
+func newECB(b cipher.Block) *ecb {
+	return &ecb{
+		b:         b,
+		blockSize: b.BlockSize(),
+	}
+}
+
+type ecbEncrypter ecb
+
+// NewECBEncrypter returns a BlockMode which encrypts in electronic code book
+// mode, using the given Block.
+func NewECBEncrypter(b cipher.Block) cipher.BlockMode {
+	return (*ecbEncrypter)(newECB(b))
+}
+
+func (x *ecbEncrypter) BlockSize() int { return x.blockSize }
+
+func (x *ecbEncrypter) CryptBlocks(dst, src []byte) {
+	if len(src)%x.blockSize != 0 {
+		panic("crypto/cipher: input not full blocks")
+	}
+	if len(dst) < len(src) {
+		panic("crypto/cipher: output smaller than input")
+	}
+	for len(src) > 0 {
+		x.b.Encrypt(dst, src[:x.blockSize])
+		src = src[x.blockSize:]
+		dst = dst[x.blockSize:]
+	}
+}
+
+type ecbDecrypter ecb
+
+// NewECBDecrypter returns a BlockMode which decrypts in electronic code book
+// mode, using the given Block.
+func NewECBDecrypter(b cipher.Block) cipher.BlockMode {
+	return (*ecbDecrypter)(newECB(b))
+}
+
+func (x *ecbDecrypter) BlockSize() int { return x.blockSize }
+
+func (x *ecbDecrypter) CryptBlocks(dst, src []byte) {
+	if len(src)%x.blockSize != 0 {
+		panic("crypto/cipher: input not full blocks")
+	}
+	if len(dst) < len(src) {
+		panic("crypto/cipher: output smaller than input")
+	}
+	for len(src) > 0 {
+		x.b.Decrypt(dst, src[:x.blockSize])
+		src = src[x.blockSize:]
+		dst = dst[x.blockSize:]
+	}
+}